If \(x\) and \(y\) are negative integers, which of the following must be true?

[Vincen]

If \(x\) and \(y\) are negative integers, which of the following must be true?

I. \(x-y>0\)
II. \(\dfrac{x}{y} >y\)
III. \(x^2>y\)

A. I only
B. II only
C. III only
D. I and III
E. II and III

Answer: E

Source: GMAT Paper Tests